Initial emulation of the Bandit ARBus-to-PCI bridge.

This commit is contained in:
Maxim Poliakovski 2022-01-16 22:47:04 +01:00
parent 74f4dbd7e6
commit cdb34032bc
2 changed files with 217 additions and 0 deletions

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Bandit ARBus-to-PCI Bridge emulation. */
#include "bandit.h"
#include <devices/memctrl/memctrlbase.h>
#include <endianswap.h>
#include <loguru.hpp>
#include <machines/machinebase.h>
#include <memaccess.h>
#include <cinttypes>
Bandit::Bandit(int bridge_num, std::string name) : MMIODevice(), PCIHost()
{
this->base_addr = 0xF0000000 + ((bridge_num & 3) << 25);
this->name = name;
MemCtrlBase *mem_ctrl = dynamic_cast<MemCtrlBase *>
(gMachineObj->get_comp_by_type(HWCompType::MEM_CTRL));
// add memory mapped I/O region for Bandit control registers
// This region has the following format:
// base_addr + 0x000000 --> I/O space
// base_addr + 0x800000 --> CONFIG_ADDR
// base_addr + 0xC00000 --> CONFIG_DATA
// base_addr + 0x1000000 - pass-through memory space (not included below)
mem_ctrl->add_mmio_region(base_addr, 0x01000000, this);
// prepare the PCI config header
std::memset(this->my_pci_cfg_hdr, 0, sizeof(this->my_pci_cfg_hdr));
WRITE_DWORD_BE_A(&this->my_pci_cfg_hdr[0x00], 0x0001106B);
WRITE_DWORD_BE_A(&this->my_pci_cfg_hdr[0x08], 0x06000003);
// mask array for protecting accesses to the PCI config header
std::memset(this->my_cfg_mask, 0xFF, sizeof(this->my_pci_cfg_hdr));
WRITE_DWORD_BE_A(&this->my_cfg_mask[0x00], 0); // make DeviceID/VendorID read-only
WRITE_DWORD_BE_A(&this->my_cfg_mask[0x08], 0); // make ClassCode/Revision read-only
WRITE_DWORD_BE_A(&this->my_cfg_mask[0x0C], 0xFF00FFFFUL); // make HeaderType read-only
}
uint32_t Bandit::read(uint32_t reg_start, uint32_t offset, int size)
{
int dev_num, dev_fn;
uint8_t reg_offs;
uint32_t result;
if (offset & BANDIT_CONFIG_SPACE) {
if (offset & 0x00400000) {
// access to the CONFIG_DATA pseudo-register causes a Config Cycle
if (this->config_addr & BANDIT_DEV_NUM) { // access to myself
result = this->pci_cfg_read(this->config_addr & 0xFFU, size);
} else {
dev_num = this->config_addr >> 12;
dev_fn = this->config_addr >> 8;
reg_offs = this->config_addr & 0xFFU;
if (this->dev_map.count(dev_num)) {
result = this->dev_map[dev_num]->pci_cfg_read(reg_offs, size);
} else {
LOG_F(
ERROR,
"%s err: read attempt from non-existing PCI device %d \n",
this->name.c_str(),
dev_num);
result = 0;
}
}
} else {
result = this->config_addr;
}
} else { // I/O space access
LOG_F(WARNING, "%s: I/O space write not implemented yet", this->name.c_str());
}
return BYTESWAP_32(result);
}
void Bandit::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
{
int dev_num, dev_fn;
uint8_t reg_offs;
if (offset & BANDIT_CONFIG_SPACE) {
if (offset & 0x00400000) {
// access to the CONFIG_DATA pseudo-register causes a Config Cycle
if (this->config_addr & BANDIT_DEV_NUM) { // access to myself
this->pci_cfg_write(this->config_addr & 0xFFU, value, size);
return;
}
dev_num = this->config_addr >> 12;
dev_fn = this->config_addr >> 8;
reg_offs = this->config_addr & 0xFFU;
if (this->dev_map.count(dev_num)) {
this->dev_map[dev_num]->pci_cfg_write(reg_offs, value, size);
} else {
LOG_F(
ERROR,
"%s err: write attempt to non-existing PCI device %d \n",
this->name.c_str(),
dev_num);
}
} else {
this->config_addr = BYTESWAP_32(value) & 0x3FFFFF;
}
} else { // I/O space access
LOG_F(WARNING, "%s: I/O space write not implemented yet", this->name.c_str());
}
}
uint32_t Bandit::pci_cfg_read(uint32_t reg_offs, uint32_t size)
{
if ((reg_offs & 3) || size != 4) {
LOG_F(WARNING, "%s: non-DWORD access to the config space", this->name.c_str());
}
return read_mem_rev(&this->my_pci_cfg_hdr[reg_offs], size);
}
void Bandit::pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size)
{
if ((reg_offs & 3) || size != 4) {
LOG_F(WARNING, "%s: non-DWORD access to the config space", this->name.c_str());
}
uint32_t mask = read_mem_rev(&my_cfg_mask[reg_offs], size);
uint32_t cur_val = read_mem_rev(&this->my_pci_cfg_hdr[reg_offs], size);
write_mem_rev(&this->my_pci_cfg_hdr[reg_offs], (cur_val & ~mask) | (value & mask), size);
}

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-22 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Bandit ARBus-to-PCI bridge definitions.
The Bandit ASIC is a custom ARBus-to-PCI bridge used in the second
generation of the Power Macintosh computer equipped with the PCI bus.
*/
#ifndef BANDIT_PCI_H
#define BANDIT_PCI_H
#include <devices/common/hwcomponent.h>
#include <devices/common/pci/pcidevice.h>
#include <devices/common/pci/pcihost.h>
#include <cinttypes>
#include <string>
#include <unordered_map>
#define BANDIT_DEV_NUM (1 << 11)
#define BANDIT_CONFIG_SPACE 0x00800000
class Bandit : public MMIODevice, public PCIHost {//}, public PCIDevice {
public:
Bandit(int bridge_num, std::string name);
~Bandit() = default;
bool supports_type(HWCompType type) {
return (type == HWCompType::PCI_HOST || type == HWCompType::PCI_DEV);
};
// MMIODevice methods
uint32_t read(uint32_t reg_start, uint32_t offset, int size);
void write(uint32_t reg_start, uint32_t offset, uint32_t value, int size);
protected:
uint32_t pci_cfg_read(uint32_t reg_offs, uint32_t size);
void pci_cfg_write(uint32_t reg_offs, uint32_t value, uint32_t size);
private:
std::string name;
uint32_t base_addr;
uint32_t config_addr;
uint8_t my_pci_cfg_hdr[256];
uint8_t my_cfg_mask[256];
};
#endif // BANDIT_PCI_H